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Microgrid has effectively mitigated the effect of distributed generation on power grid, thus boasting excellent development potential. This paper discusses the comprehensive benefits of microgrid in improving reliability, energy saving and consumption reduction, environmental protection, investment deferral in transmission and distribution grids from the social perspective. It analyzes the cost composition...
Based on equivalent model of power network and voltage stability index, a coordinated voltage stability control scheme is developed in this paper. According to the relationship between power transfer capability and grid-side voltage source potential of two node power system, power network equivalent model is used to study on voltage stability control, and it is proposed that the control function is...
The hard-wired 11kV Interlock Overcurrent Busbar Protection (ILOC BBP) scheme has been widely applied for the protection of 11kV double-busbar switchboard. Its design is based on a general blocking scheme through the use of programmable logic techniques in numerical relay application. For continuous improvement in the performance and reliability, a new ILOC BBP scheme has recently been developed successfully...
Due to the pull of applications and the push of advanced technologies, energy storage will be important in future electric power systems. This paper presents the functions that energy storage can perform along the electricity value chain, overviews various energy storage technologies and provides the best storage technologies for individual and bundled applications.
In the recent years, there are many studies about wind turbine dynamic behaviors and the impact of wind power integration on the power system. However, the WT dynamic behaviors were usually simplified while studying the influence on the power system. That is, the dynamic performance was studied with a fairly simple model of the power system because many research works did not consider the modeling...
As HVDC is superior to AC in some aspects, such as transmission capacity, controllability and stability, HVDC has been applied widely around the world. At present, research on recovery path of outage grid mainly focuses on the restarting of thermal power units and hydropower unit, while little attention is paid on the restoration of DC converter station. The restarting of DC converter station needs...
The electrical vehicle (EV) charging/swapping stations are fundamental facilities for the development of EVs, this paper introduces a systematic approach for the cost benefit analysis (CBA) of the EV charging/swapping station. It starts from the scale of the stations, with restriction of reasonable allowable time from customers. The critical part of the station is described by queuing model, the parameters...
Unstable equilibrium point (UEP) and dynamic saddle point (DSP) are completely different concepts in the power system transient stability analysis. However, some research still hold the view that UEP accurately reflects the power system transient stability and try to define and find the so-called related UEP. In this paper, the differences and correlations between UEP and DSP in reflecting system...
In almost all the literatures, the qualitative assessment of transient angle stability extracts the angle information of generators based on the swing curve. As the angle (or angle difference) of concern and the threshold value rely strongly on the engineering experience, the validity and robust of these criterions are weak. Based on the stability mechanism from the extended equal area criterion (EEAC)...
In order to realize more efficient electricity supply system, smart grid technologies, which are driven by the collaboration between power system technology and information and communication technology, are indispensable. One of these technologies is the smart metering infrastructure, which play a big role especially in the field of retail supply and distribution network modernization. This paper...
Historically, CLP had been employing renowned cable manufacturers from locations like European countries or Japan due to their obvious technological advantage and experience. Those cable manufacturers were capable of supplying a full spectrum of cables and accessories, giving assurance of good quality, convenience to project management and clear demarcation of accountabilities.
The prosperity of Hong Kong highly relies on devoted people from various industries, and power industry is one of them to keep the city prosper. To ensure power supply of high quality, three aspects are what we concern most, “Reliable and safe supply of electricity”, “Environmental Care” and “Reasonable tariff”. They are the three vital targets for that we carried out myriads of actions and strategies...
This paper aims at a systematical review of the state-of-art-of research work on the distributed generation planning in today's distribution system. With the increasing percentage of the DG installation in the system, the impact of DG in voltage profile and stability has to be appropriately evaluated. For this reason, some research considers voltage stability as the main objective or important constraint...
Smart grid is a term referring to the next generation power grid in which the electricity distribution and management is upgraded by incorporating advanced two-way communications and pervasive computing capabilities for improved control, efficiency, reliability and safety. The paper proposes a heuristic best-fit clustering approach to obtain the minimum number and location of powerful nodes to fulfill...
With the continuous expansion of modern power systems, traditional black-start decision-making methods are increasingly incapable of meeting modern blackout restoration requirements. More effective methods are demanded for quick power network restoration after blackouts. Considering the interactions among different black-start decision-making indexes, multiple experts and their language assessment...
An energy storage system (ESS) can provide regulation and reserve capacities for the power system, and hence alleviate the negative impacts of renewable energy such as wind power. Nonetheless, challenges remain as to how the operation of wind farms and ESSs can be coordinated efficiently, and how transmission system expansion planning will be impacted. This paper addresses these challenges by: 1)...
Take into account the unique geographical location of Australia, there is a time difference of two hours between east and west coasts of the country. This means the peak of energy usage in the two regions will occur in two different time periods. This paper studies the feasibility of building a transmission line to connect the energy markets in both east and west Australia. A simplified market simulation...
In this paper, an improved hybrid approach which is based on classic programming, evolutionary algorithm (EA) and critical machine (CM) theory is proposed for faster convergence of multi-contingency transient stability-constrained optimal power flow (TSC-OPF) computation. The method involves two iterative steps, in which the first step searches the solution region that fits the required transient...
With the advent of demand side management (DSM) in smart grid environment, energy can be operated more effectively from the consumers' side. In this paper firstly a day-ahead DSM optimization problem is formulated, which includes demand, generation, storage and cost models. Then a scenario based study for Australian residential households is conducted to reveal the effect of the pricing and regulation...
Failures of the standby power systems in many applications are well documented and it can lead to premature system shutdown leading to lengthy delays in industrial applications or in Railway applications endangering lives. After such incidents the failures are typically attributed to either poor maintenance or in a lot of cases the design errors. This article explore the latter and highlights the...
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